28758231031 has 4 divisors (see below), whose sum is σ = 29749894200. Its totient is φ = 27766567864.

The previous prime is 28758231023. The next prime is 28758231037. The reversal of 28758231031 is 13013285782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28758231031 - 2³ = 28758231023 is a prime.

It is a super-2 number, since 2×28758231031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28758231037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495831541 + ... + 495831598.

It is an arithmetic number, because the mean of its divisors is an integer number (7437473550).

Almost surely, 2^28758231031 is an apocalyptic number.

28758231031 is a deficient number, since it is larger than the sum of its proper divisors (991663169).

28758231031 is an equidigital number, since it uses as much as digits as its factorization.

28758231031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991663168.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 28758231031 in words is "twenty-eight billion, seven hundred fifty-eight million, two hundred thirty-one thousand, thirty-one".